[time-nuts] surface mount (was PICTIC II Parts from Mouser)

Bob Bownes bownes at gmail.com
Tue Jul 20 00:09:50 EDT 2010


A few short videos shot with the camera/usb video capture setup I
mentioned earlier:

http://www.fastbobs.com/bob/radio/video1.mpg Video 1 - Black & White
inspection of a prototype power sensor. Low magnification
http://www.fastbobs.com/bob/radio/video2.mpg Video 2 - Colour
inspection of same sensor. Same magnification. About 2-3x
http://www.fastbobs.com/bob/radio/video3.mpg Video 3 - Longer version
of #2. Note lighting changes in 2nd half.
http://www.fastbobs.com/bob/radio/video4.mpg Video 4 - Short, color,
higher magnification
http://www.fastbobs.com/bob/radio/video5.mpg Video 5 - Longest,
highest magnification. Same probe as earlier shots. Note lighting
changes as the light source is moved around showing shadows.


On Mon, Jul 19, 2010 at 9:22 PM, Robert J Marinelli <bobm at stanford.edu> wrote:
> Hi Richard,
>
> Yes, used to feel that way - until acquiring a surplus dissecting (stereo)
> microscope, now I actually *prefer* surface mount.  Much easier to move
> parts around, it's easy to apply paste & solder entire boards in a $50
> toaster oven, and access to all the latest parts.  Hard to believe, but
> really is easier once you can clearly see.  For some nice tuturials, see the
> sparkfun website, also the schmartboard website.  Also, when I lay out
> surface mount boards, they tend to be smaller overall, and so a bit lower
> cost.
>
> Please do try with a low cost stereo microscope - it changes everything :)
>
> -Bob
>
> p.s. Finger size is no issue - tweezers work nicely.  Oh and surface mount
> resistors & caps are unbelievably low cost in cut tape, and super easy to
> handle that way.  Much better than loose parts IMO.
>
> On Jul 19, 2010, at 4:59 PM, Richard H McCorkle wrote:
>
>> The TS272CN is an acceptable substitute for the TS272ACN in the
>> PICTIC II but as noted has a higher input offset voltage. This
>> can be compensated for in the second stage by adjustment of
>> the offset trimmer. I selected premium parts for temperature
>> stability in the application. Sorry the manufacturers are
>> making "human compatible" devices obsolete and only carrying
>> over surface mount devices as they go Pb free for the EU
>> market. Makes it difficult to keep up with what's available
>> and harder for amateurs with fat fingers and poor eyesight
>> like myself to build simple projects!
>>
>> Richard
>>
>>
>>> Here we go again!
>>>
>>> The TS272ACN has just gone 'non-stocked' at Mouser.  Will the TS272CN
>>> degrade the performance?  It looks like the difference between the two
>>> is the TS272CN has a higher input offset voltage.
>>>
>>> Ed
>>>
>>>
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>>
>>
>>
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